IP Header fields
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Posted By:   A_S
Posted On:   Monday, May 26, 2003 08:48 PM




what is the purpose of the following ip header fields?


Time To Live.


Protocol.


Flags.

Re: IP Header fields

Posted By:   Christopher_Schultz  
Posted On:   Tuesday, May 27, 2003 07:01 AM

From RFC 791:




Time to Live: 8 bits



This field indicates the maximum time the datagram is allowed to
remain in the internet system. If this field contains the value
zero, then the datagram must be destroyed. This field is modified
in internet header processing. The time is measured in units of
seconds, but since every module that processes a datagram must
decrease the TTL by at least one even if it process the datagram in
less than a second, the TTL must be thought of only as an upper
bound on the time a datagram may exist. The intention is to cause
undeliverable datagrams to be discarded, and to bound the maximum
datagram lifetime.



The other header fields are documented in the same document.



-chris
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